Timepiece

Abstract

A timepiece includes a platen ( 10 ) and a barrel mounted on the platen, the barrel including: a drum ( 20 ) with a bottom and side walls; a shaft ( 14 ) extending through the drum at the center thereof and provided with pivoting elements ( 40, 54 ) on the platen; a leaf spring provided in the drum and co-operating with the shaft at one end and with the drum at the other end; and a lid ( 28 ) through which the shaft extends and closing the drum, a ratchet wheel ( 30 ) being kinematically connected to the shaft for winding the spring. According to the invention, the drum is pivoted via a first ball bearing ( 34 ) having a bushing ( 36 ) connected to the platen and another bushing ( 38 ) connected to the bottom of the drum.

1. A timepiece comprising a plate and a barrel mounted on the plate, said barrel comprising
 a drum comprising a bottom and side walls, 
 an arbor going through the center of the drum and provided with pivoting means on the plate, 
 a strip spring housed in the drum and cooperating by a first end with the arbor and by a second end with the drum, and 
 a lid passed through by the arbor and closing said drum, 
 a ratchet wheel being kinematically connected to the arbor for winding of said spring, 
 wherein the drum is pivoted by a first ball bearing whereof one ring is integral with the plate and another ring is integral with the bottom of said drum, wherein said another ring is arranged on the side of the bottom of said drum, in direction of the plate. 
 
     
     
       2. The timepiece of  claim 1 , wherein the barrel-arbor is pivoted in the plate using a second ball bearing. 
     
     
       3. The timepiece of  claim 2 , wherein the barrel-arbor and the drum are mounted pivoting in relation to the plate via a ball bearing comprising an intermediate ring fixed to the plate, an inner ring integral with the arbor and an outer ring integral with the bottom of the drum. 
     
     
       4. The timepiece of  claim 2 , wherein the barrel arbor and the drum are mounted pivoting in relation to the plate through a ball bearing comprising an intermediate ring fixed to the bottom of the drum, an inner ring integral with the arbor and an outer ring integral with the plate. 
     
     
       5. The timepiece of  claim 4 , wherein said outer ring is driven into a hollow arranged in the plate. 
     
     
       6. The timepiece according to  claim 1 , characterized in that, moreover, the barrel-arbor is pivoted by a third ball bearing at its end located opposite the plate. 
     
     
       7. The timepiece of  claim 6 , wherein said third ball bearing is arranged using a bridge topping the barrel. 
     
     
       8. The timepiece of  claim 7 , wherein said ratchet wheel is arranged on the side of the bridge opposite the barrel. 
     
     
       9. The timepiece of  claim 6 , characterized in that said third ball bearing is housed in said lid.